A Lithium Ion Highway by Surface Coordination Polymerization: In Situ Growth of Metal–Organic Framework Thin Layers on Metal Oxides for Exceptional Rate and Cycling Performance. Issue 48 (3rd August 2017)

• Record Type: Journal Article
• Authors: Han, Yuzhen; Yu, Danni; Zhou, Junwen; Xu, Peiyu; Qi, Pengfei; Wang, Qianyou; Li, Siwu; Fu, Xiaotao; Gao, Xing; Jiang, Chenghao; Feng, Xiao; Wang, Bo
• Is Part Of: Chemistry. Volume 23:Issue 48(2017)
• Page Start: 11513
• Page End: 11518
• Publication Date: 2017-08-03
• Subjects: anode materials -- lithium ion batteries -- metal–organic frameworks -- metal oxides -- surface coordination polymerization; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201703016
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract: A thin layer of a highly porous metal–organic framework material, ZIF‐8, is fabricated uniformly on the surface of nanostructured transition metal oxides (ZnO nanoflakes and MnO2 nanorods) to boost the transfer of lithium ions. The novel design and uniform microstructure of the MOF‐coated TMOs (ZIF‐8@TMOs) exhibit dramatically enhanced rate and cycling performance comparing to their pristine counterparts. The capacities of ZIF‐8@ZnO (nanoflakes) and ZIF‐8@MnO2 (nanorods) are 28 % and 31 % higher that of the pristine ones at the same current density. The nanorods of ZIF‐8@MnO2 show a capacity of 1067 mAh g −1 after 500 cycles at 1 Ag −1 and without any fading. To further improve the conductivity and capacity, the ZIF‐8‐coated materials are pyrolyzed at 700 °C in an N2 atmosphere (ZIF‐8@TMO‐700 N). After pyrolysis, a much higher capacity improvement is achieved: ZIF‐8@ZnO‐700 N and ZIF‐8@MnO2 ‐700 N have 54 % and 69 % capacity increases compared with the pristine TMOs, and at 1 Ag −1, the capacity of ZIF‐8@MnO2 ‐700 N is 1060 mAh g −1 after cycling for 300 cycles. Abstract : It does get in : A thin layer of a highly porous metal–organic framework material, ZIF‐8, is fabricated uniformly on the surface of nanostructured ZnO nanoflakes and MnO2 nanorods to boost the transfer of lithium ions.